Find the perimeter of a semicircular piece of wood with a diameter of 12 inches. Round your answer to the nearest tenth. 

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

What does the sign of the slope tell you about a line?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.